Hi Guys, I recently purchased an E34 1989 model 535i and Im thinking its fuel economy is way out.

I filled up with 65 litres of unleaded fuel and it lasted me 400 - 410 km.

Is this normal , the reading on my dash for fuel consumtion is at 16.4L per 100km. In my opinion this should be much lower and I should get a lot more. Please let me know your thoughts, and please offer any advice on what you think may need to bee fixed.